I am a PM overseeing and managing the product team and deliverable. I am a newbie to Openedex as my company just decided to go for it. I would like to join the forum to get educated on the software and share my findings as well with the everyone. I am exited to be joining the Openedex family!
Hello Hala and welcome,
You can start from surfing https://edx.org and https://open.edx.org
Then try to install open edx yourself to understand how are the UI and UX of lms/studio exactly.
If you decided to develop and make changes you need to setup a devstack which is a set of docker machines to help open edx developers.